JP3180733B2 - Wireless communication system - Google Patents
Wireless communication systemInfo
- Publication number
- JP3180733B2 JP3180733B2 JP28524797A JP28524797A JP3180733B2 JP 3180733 B2 JP3180733 B2 JP 3180733B2 JP 28524797 A JP28524797 A JP 28524797A JP 28524797 A JP28524797 A JP 28524797A JP 3180733 B2 JP3180733 B2 JP 3180733B2
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- Prior art keywords
- base station
- antennas
- antenna
- communication system
- signals
- Prior art date
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- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は通信システムに関
し、自動車電話等をはじめとする通信システムに関する
ものである。[0001] 1. Field of the Invention [0002] The present invention relates to a communication system, and more particularly to a communication system such as an automobile telephone.
【０００２】[0002]
【従来の技術】自動車電話システムは、通信ネットワー
クにつながる基地局と、携帯電話等に相当する移動局か
ら構成される。ここで、基地局と移動局の通信可能距離
は、送信できるパワーに深く関係している。ここで、非
常に広い領域をカバーするためには、複数の基地局を準
備し、これら複数の基地局から、同一周波数で同一の信
号を送信する手法が考えられる。2. Description of the Related Art An automobile telephone system comprises a base station connected to a communication network and a mobile station corresponding to a mobile phone or the like. Here, the communicable distance between the base station and the mobile station is deeply related to the transmittable power. Here, in order to cover a very wide area, a method of preparing a plurality of base stations and transmitting the same signal at the same frequency from the plurality of base stations can be considered.
【０００３】図７は従来の通信システムを示すブロック
図である。図において、１はネットワークより入力され
る送信情報入力端子、２Ａ、２Ｂは第１及び第２の基地
局、３Ａ、３Ｂはそれぞれ第１及び第２の基地局のアン
テナ、４は移動局、５は移動局のアンテナである。第１
の基地局２Ａは、送信すべき情報をアンテナ３Ａより送
信する。同様に、第２の基地局２Ｂは、送信すべき情報
をアンテナ３Ｂより送信する。移動局４はアンテナ５よ
り、２つの基地局２Ａ、２Ｂからの送信信号を受信す
る。FIG. 7 is a block diagram showing a conventional communication system. In the figure, 1 is a transmission information input terminal input from the network, 2A and 2B are first and second base stations, 3A and 3B are antennas of the first and second base stations, respectively, 4 is a mobile station, 5 Is the antenna of the mobile station. First
The base station 2A transmits information to be transmitted from the antenna 3A. Similarly, the second base station 2B transmits information to be transmitted from the antenna 3B. The mobile station 4 receives transmission signals from the two base stations 2A and 2B from the antenna 5.
【０００４】通常、電波環境は、移動局４と基地局２
Ａ、２Ｂの位置関係で決定される。移動局４は２つの基
地局２Ａ、２Ｂからの送信信号ＳＡ、ＳＢを同時に受信
する。例えば、図８のように、ある特定の地域で第１の
基地局２Ａからの受信信号ＲＡと第２の基地局２Ｂの受
信信号ＲＢの電力は同一なのであるが、極性が逆になる
場合がある（移動局４と２つの基地局２Ａ、２Ｂの距離
がほぼ同一の場合）。この場合、２つの受信信号ＲＡ、
ＲＢは相殺しあい、合成した後は信号がなくなってしま
う現象が生じる。また、例えば図９のように、送信信号
ＳＡ、ＳＢのタイミングを２つの基地局２Ａ、２Ｂ間で
異なったものとしても、移動局４と第１の基地局２Ａと
の距離の方が、移動局４と第２の基地局２Ｂとの距離よ
り大きい場合は、２つの受信信号ＲＡ、ＲＢを合成した
後に、信号が相殺されるてしまう場合がある。Normally, the radio wave environment includes the mobile station 4 and the base station 2
A is determined by the positional relationship between A and 2B. The mobile station 4 simultaneously receives transmission signals SA and SB from the two base stations 2A and 2B. For example, as shown in FIG. 8, although the power of the received signal RA from the first base station 2A and the power of the received signal RB of the second base station 2B are the same in a specific area, the polarity may be reversed. (When the distance between the mobile station 4 and the two base stations 2A and 2B is almost the same). In this case, the two received signals RA,
The RBs cancel each other, and a phenomenon occurs in which the signal disappears after the combination. Also, for example, as shown in FIG. 9, even if the timings of the transmission signals SA and SB are different between the two base stations 2A and 2B, the distance between the mobile station 4 and the first base station 2A is larger. If the distance is larger than the distance between the station 4 and the second base station 2B, the signals may be canceled after the two received signals RA and RB are combined.
【０００５】[0005]
【発明が解決しようとする課題】ここで、特許第２５７
２７６５号のように、基地局に複数のアンテナを備え、
送信信号に１シンボル以上の遅延を与える手法を、カバ
ーエリアの大きい通信システムを実現することが考えら
れる。この手法を図１０に示す。図において、１はネッ
トワークより入力される送信情報入力端子、２は基地
局、３Ａは基地局２の第１のアンテナ、３Ｂは基地局２
の第２のアンテナ、４は移動局、５は移動局４のアンテ
ナ、６は遅延である。SUMMARY OF THE INVENTION Here, Japanese Patent No. 257
As in No. 2765, the base station has a plurality of antennas,
The technique of giving a delay of one symbol or more to a transmission signal can be considered to realize a communication system having a large coverage area. This technique is illustrated in FIG. In the figure, 1 is a transmission information input terminal input from the network, 2 is a base station, 3A is a first antenna of the base station 2, 3B is a base station 2
Is a second mobile station, 4 is a mobile station, 5 is an antenna of the mobile station 4, and 6 is a delay.
【０００６】基地局２は、送信すべき情報を第１のアン
テナ３Ａより送信する。同様に、同一情報を遅延６に
て、１シンボル以上遅延させて第２のアンテナ３Ｂより
送信する。移動局４はアンテナ５より、基地局２の２つ
アンテナ３Ａ、３Ｂのからの送信信号を受信する。この
際に、送信側の２つのアンテナ３Ａ、３Ｂより受信され
る信号には、時間差があるため、等化器で補正する。こ
こで、仮に送信アンテナ３Ａ、３Ｂからの電波環境が独
立であると仮定できれば、ダイバーシチ効果による特性
改善が可能である。ところがこの構成は、基地局が単一
であり、さらに送信信号に１シンボル以上の遅延を与え
るため、受信側の等化器の回路規模が増大する問題があ
り、解決策としては未だ不十分であった。[0006] The base station 2 transmits information to be transmitted from the first antenna 3A. Similarly, the same information is transmitted from the second antenna 3B with a delay of one symbol or more with a delay of 6. The mobile station 4 receives transmission signals from the two antennas 3A and 3B of the base station 2 from the antenna 5. At this time, since there is a time difference between the signals received from the two transmitting antennas 3A and 3B, the signals are corrected by the equalizer. Here, if it can be assumed that the radio wave environment from the transmitting antennas 3A and 3B is independent, it is possible to improve the characteristics by the diversity effect. However, this configuration has a problem that the circuit size of the equalizer on the receiving side increases because a single base station is used and a delay of one symbol or more is added to a transmission signal, which is still insufficient as a solution. there were.
【０００７】上述のように従来の通信システムで、カバ
ー領域の広い通信システムを実現する場合、特定の場所
で、複数の基地局からの信号が互いを打ち消しあい、信
号受信が困難となる問題があり、また各基地局間での相
対遅延量差を大きくすると、受信側の等化器が複雑にな
るという問題があった。As described above, when a communication system having a wide coverage area is realized by the conventional communication system, signals from a plurality of base stations cancel each other out at a specific location, which makes signal reception difficult. In addition, if the relative delay difference between the base stations is increased, there is a problem that the equalizer on the receiving side becomes complicated.
【０００８】この発明は以上の問題を解消するためにな
されたもので、複数の基地局間に存在する移動局で全て
の信号が合成後に消失する現象を未然に防止し、簡易な
構成で広範囲な領域をカバーできる無線通信システムを
提供するものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to prevent a phenomenon in which all signals are lost after combining in a mobile station existing between a plurality of base stations, and to realize a wide range with a simple configuration. It is intended to provide a wireless communication system capable of covering various areas.
【０００９】[0009]
【課題を解決するための手段】かかる課題を解決するた
めにこの発明に係る無線通信システムでは、複数の基地
局が同一の信号を同一の周波数で送信し、広範囲な領域
をカバーする無線通信システムにおいて、複数のアンテ
ナを備えた基地局を少なくとも２局以上配置し、複数の
アンテナを備えた第１の基地局は、該基地局の複数のア
ンテナ各々にそれぞれ遅延時間が異なる信号を供給し、
当該第１の基地局の複数のアンテナ各々から送信される
信号相互間に所定の相対遅延時間を生じさせ、前記第１
の基地局に隣接する複数のアンテナを備えた第２の基地
局は、該基地局の複数のアンテナ各々にそれぞれ遅延時
間が異なる信号を供給し、当該第２の基地局の複数のア
ンテナ各々から送信される信号相互間に前記第１の基地
局と異なる相対遅延時間を生じさせる構成とされたこと
を特徴とする。 In order to solve the above-mentioned problems, in a radio communication system according to the present invention, a plurality of base stations transmit the same signal at the same frequency to cover a wide area. , Multiple antennas
At least two or more base stations equipped with
A first base station with an antenna has a plurality of antennas for the base station.
Each delay signal is supplied to each antenna,
Transmitted from each of the plurality of antennas of the first base station
A predetermined relative delay time is generated between the signals, and the first
Base station with multiple antennas adjacent to a base station
The station transmits each of the plurality of antennas of the base station with a delay.
A signal having a different interval is supplied, and a plurality of addresses of the second base station are provided.
The first base between signals transmitted from each of the antennas
A configuration that generates a different relative delay time from the station
It is characterized by.
【００１０】また次の発明に係る無線通信システムで
は、複数のアンテナを備えた基地局を含む複数の基地局
からの信号を受信する移動局は、前記各基地局の１又は
複数のアンテナから送信される信号を受信処理する等化
器を備えることを特徴とする。 [0010] In a wireless communication system according to the next invention, the mobile station for receiving signals from a plurality of base stations including a base station having a plurality of antennas, transmitting from said one or more antennas of each base station And an equalizer for receiving and processing the received signal.
【００１１】[0011]
【発明の実施の形態】以下図面を参照しながら、この発
明の実施の形態について詳述する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００１２】図１に本発明における通信システムの実施
の形態を示す。図において、１はネットワークより入力
される送信情報入力端子、２Ａは第１の基地局、２Ｂは
第２の基地局、３Ａ、３Ｂはそれぞれ第１及び第２の基
地局２Ａ、２Ｂの第１のアンテナ、３Ｃ、３Ｄはそれぞ
れ第１及び第２の基地局２Ａ、２Ｂの第２のアンテナ、
４は移動局、５は移動局のアンテナ、６Ａ、６Ｂは第１
及び第２の遅延である。FIG. 1 shows an embodiment of a communication system according to the present invention. In the figure, 1 is a transmission information input terminal input from the network, 2A is a first base station, 2B is a second base station, 3A and 3B are first and second base stations 2A and 2B, respectively. , 3C and 3D are second antennas of the first and second base stations 2A and 2B, respectively.
4 is a mobile station, 5 is an antenna of the mobile station, 6A and 6B are first.
And a second delay.
【００１３】第１の基地局２Ａは、送信するべき情報を
アンテナ３Ａより遅延なく送信すると共に、アンテナ３
Ｃより遅延６Ａを付加して送信する。同様に、基地局２
Ｂは、送信するべき情報をアンテナ３Ｂより遅延なく送
信すると共に、アンテナ３Ｄより遅延６Ｂを付加して送
信する。移動局４はアンテナ５より、上記４つのアンテ
ナ３Ａ〜３Ｄからの送信信号を受信する。なお、遅延６
Ａと遅延６Ｂは異なった遅延量とする。The first base station 2A transmits information to be transmitted without delay from the antenna 3A,
A delay 6A is added from C and transmitted. Similarly, base station 2
B transmits the information to be transmitted from the antenna 3B without delay and transmits the information with a delay 6B from the antenna 3D. The mobile station 4 receives transmission signals from the four antennas 3A to 3D from the antenna 5. Note that delay 6
A and the delay 6B have different delay amounts.
【００１４】通常、第１の基地局２Ａのアンテナ３Ａ及
びアンテナ３Ｃの距離は、基地局間の距離と比較して無
視できるくらい小さい。また、同様に、第２の基地局２
Ｂのアンテナ３Ｂ及び３Ｄの距離も、基地局間の距離と
比較して無視できるくらい小さい。このように構成した
場合、移動局４の位置により、合成信号が完全に消失す
るパターンは、図２のように、遅延６Ａと遅延６Ｂが同
一で、基地局２Ａのアンテナ３Ａの信号と基地局２Ｂの
アンテナ３Ｂの信号がお互いに相殺し、基地局２Ａのア
ンテナ３Ｃの信号と基地局２Ｂのアンテナ３Ｄの信号が
お互いに相殺する場合である。Normally, the distance between the antennas 3A and 3C of the first base station 2A is negligibly small as compared with the distance between the base stations. Similarly, the second base station 2
The distance between B antennas 3B and 3D is also negligible compared to the distance between base stations. In this configuration, the pattern in which the combined signal is completely lost depending on the position of the mobile station 4 has the same delay 6A and delay 6B as shown in FIG. 2, and the signal of the antenna 3A of the base station 2A and the base station 2A In this case, the signal of the antenna 3B of the base station 2B cancels each other, and the signal of the antenna 3C of the base station 2A and the signal of the antenna 3D of the base station 2B cancel each other.
【００１５】この実施の形態の場合、遅延６Ａと遅延６
Ｂは異なった値と設定しているため、このような現象は
生じない。実際は各アンテナ３Ａ〜３Ｄ間で一方の信号
が相殺される場合がある。これは、次の４通りである。
まず図３に示すように、第１の基地局２Ａの第１のアン
テナ３Ａの信号と第２の基地局２Ｂの第１のアンテナ３
Ｂの信号がお互いに相殺する場合である。次に図４に示
すように、第１の基地局２Ａの第１のアンテナ３Ａの信
号と第２の基地局２Ｂの第２のアンテナ３Ｄの信号がお
互いに相殺する場合である。さらに図５に示すように、
第１の基地局２Ａの第２のアンテナ３Ｃの信号と第２の
基地局２Ｂの第１のアンテナ３Ｂの信号がお互いに相殺
する場合である。さらに最後に図６に示すように、第１
の基地局２Ａの第２のアンテナ３Ｃの信号と第２の基地
局２Ｂの第２のアンテナ３Ｄの信号がお互いに相殺する
場合である。In this embodiment, the delay 6A and the delay 6
Since B is set to a different value, such a phenomenon does not occur. Actually, one of the signals may be canceled between the antennas 3A to 3D. This is the following four cases.
First, as shown in FIG. 3, the signal of the first antenna 3A of the first base station 2A and the first antenna 3 of the second base station 2B
This is the case where the signals of B cancel each other. Next, as shown in FIG. 4, there is a case where the signal of the first antenna 3A of the first base station 2A and the signal of the second antenna 3D of the second base station 2B cancel each other. Further, as shown in FIG.
This is the case where the signal of the second antenna 3C of the first base station 2A and the signal of the first antenna 3B of the second base station 2B cancel each other. Finally, as shown in FIG.
In this case, the signal of the second antenna 3C of the base station 2A and the signal of the second antenna 3D of the second base station 2B cancel each other.
【００１６】ところがこの実施の形態では、図３〜図６
より明らかなように、合成信号は必ず残っており、これ
ら合成信号を等化器を用いて判定することができる。な
お、図３〜図６より明らかなように、設定する遅延量は
必ずしも１シンボル以上の必要はなく、より小さい遅延
量を設定しても同様の効果を実現できる。However, in this embodiment, FIGS.
As is clearer, synthesized signals always remain, and these synthesized signals can be determined using an equalizer. As apparent from FIGS. 3 to 6, the delay amount to be set does not necessarily need to be one symbol or more, and the same effect can be realized even if a smaller delay amount is set.
【００１７】従ってこのような構成によれば、複数の基
地局がそれぞれ有する複数のアンテナの相対遅延時間の
組合わせを、隣接する基地局間で異なったものにするこ
とにより、特定の地域ですべての信号が合成後に消失す
るという現象を未然に防止できる。加えて、アンテナの
電波環境を独立に設定することにより、ダイバーシチ効
果による特性改善も享受できる。更には、遅延設定を１
シンボル以上に設定しないことも可能で、移動局の等化
器の回路規模を削減できる。Therefore, according to such a configuration, the combination of the relative delay times of the plurality of antennas of each of the plurality of base stations is made different between adjacent base stations, so that all the combinations can be performed in a specific area. Can be prevented from disappearing after combining. In addition, by independently setting the radio wave environment of the antenna, it is possible to enjoy the characteristic improvement by the diversity effect. Further, the delay setting is set to 1
It is also possible not to set the number of symbols equal to or larger than the number of symbols, and the circuit scale of the equalizer of the mobile station can be reduced.
【００１８】[0018]
【発明の効果】上述のようにこの発明によれば、複数の
基地局がそれぞれ有する複数のアンテナの相対遅延時間
の組合わせを、隣接する基地局間で異なったものにする
ことにより、特定の地域ですべての信号が合成後に消失
するという現象を未然に防止できる。加えて、アンテナ
の電波環境を独立に設定することにより、ダイバーシチ
効果による特性改善も享受できる。更には、遅延設定を
１シンボル以上に設定しないことも可能で、移動局の等
化器の回路規模を削減できる。かくして広範囲な領域を
カバーし得る無線通信システムを実現できる。As described above, according to the present invention, a specific combination of relative delay times of a plurality of antennas of a plurality of base stations can be made different between adjacent base stations. It is possible to prevent a phenomenon that all signals disappear in the area after the combination. In addition, by independently setting the radio wave environment of the antenna, it is possible to enjoy the characteristic improvement by the diversity effect. Further, the delay setting may not be set to one symbol or more, and the circuit scale of the equalizer of the mobile station may be reduced. Thus, a wireless communication system that can cover a wide range can be realized.
【図１】 この発明による無線通信システムの実施の形
態１の構成を示すブロック図である。FIG. 1 is a block diagram illustrating a configuration of a wireless communication system according to a first embodiment of the present invention.
【図２】 この発明による無線通信システムにおける電
波伝播の前提条件を示すタイミングチャートである。FIG. 2 is a timing chart showing preconditions for radio wave propagation in a wireless communication system according to the present invention.
【図３】 この発明による無線通信システムの実施の形
態１の電波伝播の説明に供するタイミングチャートであ
る。FIG. 3 is a timing chart for explaining radio wave propagation according to the first embodiment of the wireless communication system according to the present invention;
【図４】 図３と同様に実施の形態１の電波伝播の説明
に供するタイミングチャートである。FIG. 4 is a timing chart for explaining radio wave propagation according to the first embodiment, similarly to FIG. 3;
【図５】 図３と同様に実施の形態１の電波伝播の説明
に供するタイミングチャートである。FIG. 5 is a timing chart for explaining radio wave propagation according to the first embodiment, similarly to FIG. 3;
【図６】 図３と同様に実施の形態１の電波伝播の説明
に供するタイミングチャートである。FIG. 6 is a timing chart for explaining radio wave propagation according to the first embodiment, similarly to FIG. 3;
【図７】 従来の複数の基地局を有する無線通信システ
ムの構成を示すブロック図である。FIG. 7 is a block diagram illustrating a configuration of a conventional wireless communication system having a plurality of base stations.
【図８】 従来の通信システムの電波伝播の説明に供す
るタイミングチャートである。FIG. 8 is a timing chart for explaining radio wave propagation in a conventional communication system.
【図９】 図８と同様に従来の無線通信システムの電波
伝播の説明に供するタイミングチャートである。FIG. 9 is a timing chart for explaining radio wave propagation in a conventional wireless communication system as in FIG.
【図１０】 時間ダイバーシチを利用した無線通信シス
テムの構成を示すブロック図である。FIG. 10 is a block diagram showing a configuration of a wireless communication system using time diversity.
１ 送信情報入力端子 ２、２Ａ、２Ｂ 基地局 ３Ａ、３Ｂ 基地局の第１のアンテナ ３Ｃ、３Ｄ 基地局の第２のアンテナ ４ 移動局 ５ 移動局のアンテナ ６、６Ａ、６Ｂ 遅延 1 transmission information input terminal 2, 2A, 2B base station 3A, 3B base station first antenna 3C, 3D base station second antenna 4 mobile station 5 mobile station antenna 6, 6A, 6B delay
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平６−169273（ＪＰ，Ａ) 特開 昭63−286027（ＪＰ，Ａ) 特開 平５−268658（ＪＰ，Ａ) 特開 平８−265244（ＪＰ，Ａ) 特開 昭58−15341（ＪＰ，Ａ) 実開 平３−94851（ＪＰ，Ｕ) 特表 平８−505503（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H04B 7/00 H04B 7/02 - 7/12 H04B 7/24 - 7/26 H04L 1/02 - 1/06 H04Q 7/00 - 7/38 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-6-169273 (JP, A) JP-A-62-286027 (JP, A) JP-A-5-268658 (JP, A) JP-A 8- 265244 (JP, A) JP-A-58-15341 (JP, A) Japanese Utility Model Application Laid-Open No. 3-94851 (JP, U) Japanese Translation of PCT International Publication No. 8-505503 (JP, A) (58) Fields investigated (Int. 7 , DB name) H04B 7/00 H04B 7 /02-7/12 H04B 7/24-7/26 H04L 1/02-1/06 H04Q 7/00-7/38
Claims (2)
数で送信し、広範囲な領域をカバーする無線通信システ
ムにおいて、前記複数の基地局のうち少なくとも２局以
上の基地局は複数のアンテナを備え、複数のアンテナを備えた第１の基地局は、該基地局の複
数のアンテナ各々にそれぞれ遅延時間が異なる信号を供
給し、当該第１の基地局の複数のアンテナ各々から送信
される信号相互間に所定の相対遅延時間を生じさせ、 前記第１の基地局に隣接する複数のアンテナを備えた第
２の基地局は、該基地局の複数のアンテナ各々にそれぞ
れ遅延時間が異なる信号を供給し、当該第２の基地局の
複数のアンテナ各々から送信される信号相互間に前記第
１の基地局と異なる相対遅延時間を生じさせる構成とさ
れた ことを特徴とする無線通信システム。A plurality of base stations transmit the same signal to the same frequency.
Wireless communication system that transmits a large number of
At least one of the plurality of base stations.2 stations or less
upperThe base station has multiple antennas,A first base station with a plurality of antennas is a multiple of the base station.
Signals with different delay times to each of
And transmits from each of the plurality of antennas of the first base station.
A predetermined relative delay time between the signals to be generated, A second antenna having a plurality of antennas adjacent to the first base station;
Two base stations, each with a plurality of antennas of the base station.
And a signal having a different delay time is supplied to the second base station.
Between the signals transmitted from each of the plurality of antennas
Configuration that causes a relative delay time different from that of one base station.
Was A wireless communication system, comprising:
数の基地局からの信号を受信する移動局は、前記各基地
局の１又は複数のアンテナから送信される信号を受信処
理する等化器を備えることを特徴とする、請求項１に記
載の無線通信システム。2. A mobile station for receiving signals from a plurality of base stations including a base station having a plurality of antennas, wherein the mobile station receives signals from one or more antennas of each of the base stations and performs an equalization process. The wireless communication system according to claim 1, further comprising a device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28524797A JP3180733B2 (en) | 1997-10-17 | 1997-10-17 | Wireless communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28524797A JP3180733B2 (en) | 1997-10-17 | 1997-10-17 | Wireless communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11122150A JPH11122150A (en) | 1999-04-30 |
| JP3180733B2 true JP3180733B2 (en) | 2001-06-25 |
Family
ID=17689029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28524797A Expired - Lifetime JP3180733B2 (en) | 1997-10-17 | 1997-10-17 | Wireless communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3180733B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69940111D1 (en) | 1999-02-16 | 2009-01-29 | Mitsubishi Electric Corp | RADIO TRANSMISSION SYSTEM, TRANSMITTER AND RECEIVER |
| JP5105834B2 (en) | 2006-11-17 | 2012-12-26 | キヤノン株式会社 | CONTROL DEVICE AND ITS CONTROL METHOD, COMMUNICATION DEVICE AND ITS CONTROL METHOD, COMMUNICATION SYSTEM, AND PROGRAM |
| JP6463215B2 (en) * | 2015-05-08 | 2019-01-30 | 三菱電機株式会社 | Radio communication apparatus, radio communication control apparatus, and radio communication system |
-
1997
- 1997-10-17 JP JP28524797A patent/JP3180733B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11122150A (en) | 1999-04-30 |
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